Alarm-gage.



Noga-85,289. 'Y l PATBNTED APR.21,1908. l

H. B. Pssn.

ALARM GAGE.

Arrnmuron rms rma. 19,1901.

l /7 15 D?? @a pressure.

UNITED srnrns PATENT OFFICE.

HARRY BENI. PRESSER, Ol" MEMPHIS, TENNESSEE.

ALARM-GA GE.

To all who/m 'it may concern:

Be it known that l, izljannv BENJAMIN lfiiicssnn, a citizen of the United States, residing at Memphis, in the county of Shelby, State of Tennessee, have invented a new and useful Alarn'llage, of which the following. is a speci'lication.

This invention rele tes to electrical alarm mechanism made operal'ile by the increase or decrease of' pressure of' air or other fluid above or below certain limits` The principalv object of the present invenf tion is to provide novel means of a simple natur-e that is entirely effective and is capa.- ble of being employedl for awide variety ol' purposes. 'For instance it may be connected to a system of4 pi )ing :surrounding or associated with a jail ce l, vault or the like, which piping holds nir or other 'fluid under it may be used in connection with steam boilers, air reservoirs, water mains, and the like for automatically giving notice when the pressure thereof rises above or falls below predetermined limits.

The preferred form of construction is illustrated' in the accompanying drawings, whereing- Figurer l. is a View of the mechanism partly diagrammatic in its character. Fig. 2 1s a front elevation of the gage. Fig. S5 is a vertical sectional view therethrough'. Fig. 4t

pointer 9 operates over the dialin spaced relation thereto, and has a shaft 10, which extends through the dial land is suitably mounted in the rear portion of the casing, being grounded on sind easing. Insulation 11 is preferably located in the central por tion of the dial around the shaft inorder to avoidanyi chance of Contact between said dial and-.shaft The dialf? is provided with a semi-circular slot 12 in which are adjustablyfmounted'contactv element-s 13 comprising headed bolts that are normally held against movement by Specification. Letters Patent.

Application filed February 19, 1907.

Patented April 2l, 190B.

Serin Nn. 358,316.

suitable nuts 14. The pointer or indicator 9 carries a yielding contact, in the form of a leaf spring i5, one end 0i' which is secured as shown at i6 to thev outer side el the pointer, the other end being formed into a loo .i 17 surrounding,r said pointer. rll he inner side of this loop has its path of movement intersecting the heads ol the contact elements Two binding posts 1S and lil'are secured tothe casing, one of which, 18, being rounded directlyr thereon, the other, as .l-Ehgbeing insulated' therefrom,v as shown at 20. The bindinfpost 2.0 is electrically connected to the dia 7 by a wire 21' located withinthe cas inv.

bA suitable source of electrical energy shown diagrammatically at 22 in Fig. 1=, hascom'iections with one oi the binding posts and;v also has connectiiins with un alarm prefer.- ably inthe forni of :in electric bell 23. This bellhns an electrical"connection 24' with. the other binding post. A switch 25l is prefere ably located inthe circuit thus iorimed.

justed in the slet 1.2 to determine the limits;

within 'which the pressure off-saidii'uid can vary without soundingtihealarm. thes'witeh 25y is closed; the circuit willz still; be.

openl as long as .the ointerf9-maintains a. po-

The gage is connected to any suitable conduit as sition4 so that the bo 117 isout offoo1 1tiactI with eitherof the hea .s 13; frs soon, however., as the pressure-inV the-conduit rises '01'. falls sufliciently to permitl theY pointer to fmowo thaty the ,loop `1.7. engages one of' saidA heads, the` circuit will; bev closed; and. the alarinwill,immediately-lue-sounded;

From the foregoing, it. is thought that the construction, operation, andfmany advan-l tages of the herein describedinventionwill be a yparent to those skilledfinthe-fart, with out 'urther description, ,andi it will beunderstoodthat var-iousohangesinthe size, shape,

proportion, andv the minordetails of; consV structionmay be resortedto without; de art'- ing from the s irit orsacrificing any. o fthe" advantages of t e invention.

' Havin thus fully describedmy invention, whatl; c aim as. new, anddesireto secure `Letters Patent, is

In. alarm. mechanism of theoharaeter set forth, ag'age comprisin ceasing, a dial-carfied 'by the easing, insu ation separatingthe dial andI casing, a rotary pointer operatingl over the dial and havinQr-a-shafty extending ling with the head, binding posts secured to x therethrough and se arated therefrom, said l thereon, the other being insulated therefrom, shaft being grounde on the easin a contact and elec-bridal connections between the insu.- 10 head mounted on the outer fae the dail, a lated binding post and the dial. Contact s rin com rising a ea seeurec at 1 1 one end tid thge ponlaer and having its other *IARRY BENJ' PRESER end located beneath the same and eoperat- Witnesses:

ROBT. E. KING,

the easing, one of the posts being grounded LINDSAY B. PHILLIPE. 

